Jumping probably.
I mostly picked this method because it's the easiest for me (it requires little research, purchases, preparation, etc compared to other methods) and because it's readily accessible to me. I live in a pretty tall apartment building (310 m), and I have roof access and solid concrete to land on.
I could buy a gun since I live in the US, but I literally don't know the first thing about guns. I feel like getting and using a gun requires a lot of research and preparation (finding the right gun, getting a gun license, practicing shooting at ranges, etc), and I can barely get myself to get out of bed in the morning let alone do all of that.
So, jumping is probably the best method I've got right now. I'm just scared to do it because of the fear of failure and my SI.